Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
8676
PUT
Zumiez
ZUMZ
$220M
| $1.78K | ﹤0.01% |
100
-1,000
| -91% | -$22.4K |
2018 Q1
33 quarters
|
|
8677
CALL
ACRES Commercial Realty
ACR
$171M
| $1.78K | ﹤0.01% |
100
-100
| -50% | -$1.96K |
2026 Q1
1 quarter
|
|
8678
PUT
GrafTech
EAF
$194M
| $1.77K | ﹤0.01% |
+300
| New | +$2.53K |
2026 Q2
0 quarters
|
|
8679
CALL
Bassett Furniture
BSET
$191M
| $1.77K | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8680
PUT
TFS Financial
TFSL
$4.67B
| $1.77K | ﹤0.01% |
100
-100
| -50% | -$1.56K |
2026 Q1
1 quarter
|
|
8681
Leverage Shares 2X Long LULU Daily ETF
LULG
$5.02M
| $1.77K | ﹤0.01% |
+291
| New | +$2.62K |
2026 Q2
0 quarters
|
|
8682
CALL
Turkcell
TKC
$4.16B
| $1.76K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
8683
PUT
Cognyte Software
CGNT
$685M
| $1.76K | ﹤0.01% |
200
-600
| -75% | -$5.69K |
2024 Q1
9 quarters
|
|
8684
ProShares Ultra MSCI Japan
EZJ
$11M
| $1.75K | ﹤0.01% |
+27
| New | +$1.68K |
2026 Q2
0 quarters
|
|
8685
First Bancorp
FBP
$4.12B
| $1.75K | ﹤0.01% |
67
+63
| +1,575% | +$1.52K |
2026 Q1
1 quarter
|
|
8686
PUT
Gossamer Bio
GOSS
$57.9M
| $1.74K | ﹤0.01% |
133
-35
| -21% | -$782 |
2023 Q2
12 quarters
|
|
8687
CALL
The Magnum Ice Cream Company N.V.
MICC
$11.7B
| $1.74K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
|
8688
PUT
The Magnum Ice Cream Company N.V.
MICC
$11.7B
| $1.74K | ﹤0.01% |
+100
| New | +$1.56K |
2026 Q2
0 quarters
|
|
8689
First Financial Bankshares
FFIN
$4.35B
| $1.73K | ﹤0.01% |
50
-307
| -86% | -$9.9K |
2025 Q4
2 quarters
|
|
8690
PUT
Clarivate
CLVT
$1.18B
| $1.73K | ﹤0.01% |
+800
| New | +$1.96K |
2026 Q2
0 quarters
|
|
8691
CALL
Hudson Technologies
HDSN
$226M
| $1.72K | ﹤0.01% |
300
-3,200
| -91% | -$18.2K |
2025 Q4
2 quarters
|
|
8692
PUT
Monro
MNRO
$443M
| $1.71K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8693
PUT
Gladstone Land Corp
LAND
$380M
| $1.7K | ﹤0.01% |
200
-2,500
| -93% | -$23.9K |
2018 Q2
32 quarters
|
|
8694
PUT
Aldeyra Therapeutics
ALDX
$38.9M
| $1.7K | ﹤0.01% |
800
-126,300
| -99% | -$217K |
2020 Q3
23 quarters
|
|
8695
Reinsurance Group of America
RGA
$17.8B
| $1.7K | ﹤0.01% |
+8
| New | +$1.67K |
2026 Q2
0 quarters
|
|
8696
Roundhill Sports Betting & iGaming ETF
BETZ
$42.6M
| $1.7K | ﹤0.01% |
+91
| New | +$1.72K |
2026 Q2
0 quarters
|
|
8697
Dimensional US Large Cap Value ETF
DFLV
$7.26B
| $1.7K | ﹤0.01% |
43
-228
| -84% | -$8.73K |
2025 Q2
4 quarters
|
|
8698
PUT
WisdomTree
WT
$3.21B
| $1.69K | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8699
CALL
DELISTED
Clear Channel Outdoor Holdings
CCO
| $1.69K | ﹤0.01% |
700
-2,000
| -74% | -$4.79K |
2025 Q3
3 quarters
|
|
8700
CALL
Orion Group Holdings
ORN
$341M
| $1.68K | ﹤0.01% |
100
-2,400
| -96% | -$33.2K |
2026 Q1
1 quarter
|
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.